如果测试失败,我想在 py.test 拆解中打印子进程输出 - 或将其发送到任何其他人类可读的输出。是否可以在拆卸时检查测试是否失败?还有其他方法可以仅在测试失败期间获取子进程命令的输出吗?
My code:
"""Test different scaffold operations."""
import subprocess
import pytest
from tempfile import mkdtemp
@pytest.fixture(scope='module')
def app_scaffold(request) -> str:
"""py.test fixture to create app scaffold."""
folder = mkdtemp(prefix="websauna_test_")
cmdline = ["..."]
worker = subprocess.Popen(cmdline, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
worker.wait(timeout=5.0)
if worker.returncode is not None:
raise AssertionError("scaffold command did not properly exit: {}".format(" ".join(cmdline)))
def teardown():
worker.terminate()
# XXX: Hard to capture this only on failure for now
print(worker.stdout.read().decode("utf-8"))
print(worker.stderr.read().decode("utf-8"))
request.addfinalizer(teardown)
您可以使用捕获测试中异常的函数来装饰测试。如果出现异常,记录进程输出:
import functools
import subprocess
import pytest
def catch_exception(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
worker = kwargs['app_scaffold']
try:
return func(*args, **kwargs)
except Exception as e:
print('stdout:', worker.stdout.read().decode("utf-8"))
print('stderr:', worker.stderr.read().decode("utf-8"))
raise
return wrapper
@pytest.fixture(scope='module')
def app_scaffold(request) -> subprocess.Popen:
"""py.test fixture to create app scaffold."""
cmdline = ["echo", "something"]
worker = subprocess.Popen(cmdline, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
worker.wait(timeout=5.0)
return worker
@catch_exception
def test_foo(app_scaffold):
assert False
该代码遗漏了示例中的一些细节,但我认为它应该包含处理案例所需的所有内容。
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